1225: Difference between revisions

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[[Category:Manual needed]]
[[Category:Manual needed]]
The '''Tektronix 1225''' is a logic analyzer that supports 16 to 48 channels, 100 MHz asynchronous, 25 MHz synchronous. It was introduced in 1989. It is equivalent to the Tektronix [[1220]], the difference being that it has three channels instead of two. It is also very similar to the to the Tektronix [[1230]] on the outside but on the inside the layout is different. It only has three probe ports instead of four and the boards are stacked horizontally instead of vertically. It was one of Tektronix effort to make an "Ease of use" logic analyzer aimed at students and engineers. The user interface clearly represents that mindset. The menus are simple and there are help guides everywhere guiding the user in what he might want to do.
The '''Tektronix 1225''' is a logic analyzer [[introduced in 1989]] that supports 16 to 48 channels, 100 MHz asynchronous, 25 MHz synchronous.  


It did not have the same expansion capability that the [[1230]] had. The only expansion available was the option boards. There was four available: parallel printer port, RS232, GPIB interface and on-line notes in foreign languages. Tektronix also had a software package (S43R101) that would run on IBM PC compatible machines.
The 1225 is equivalent to the Tektronix [[1220]] but has one more 16-bit probe input. It is also very similar to the Tektronix [[1230]] on the outside, but on the inside the layout is different − the 1225 has three probe inputs instead of four and the boards are stacked horizontally instead of vertically.
 
The 1225 was one of Tektronix' efforts to make an "easy to use" logic analyzer aimed at students and engineers. The user interface clearly represents that mindset. The menus are simple and there are help guides everywhere guiding the user in what he might want to do.
 
The 1225 did not have the same expansion capability that the [[1230]] had. The only expansion available was the option boards, of which four were available − [[parallel printer interface]], [[RS-232 interface]], [[GPIB interface]], and on-line notes in foreign languages. Tektronix also had a software package (S43R101) that would run on IBM PC compatible machines.


{{BeginSpecs}}
{{BeginSpecs}}
It uses either [[P6444]] or [[P6443]] 16-channel probes.
{{Spec | Number of channels | 48 channels }}
{{Spec | Number of channels | 48 channels }}
{{Spec | CRT | 13 x 10 cm }}
{{Spec | Probes | either [[P6444]] or [[P6443]] (16-channel) }}
{{Spec | CRT | 13 cm × 10 cm }}
{{Spec | Power | 90-250 V}}
{{Spec | Power | 90-250 V}}
{{Spec | Weight | 8.6 kg (19 lb.) }}  
{{Spec | Weight | 8.6 kg (19 lb.) }}  
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==Internals==
==Internals==


The 1225 is built around a 65C02 as the control processor with 104K of SRAM, and 128K of firmware in a bank of EPROMs. There is a separate board under it that manages the display and keypad. It is powered by a same 65C02 CPU, it is using a MC68A45 CRT driver as a display driver. The display has 56K of RAM and 8K of ROM. There are two coin cell batteries that retain settings. The problem is that there is a bug that prevents it from keeping the date after the year 2000. Upon powering it on and off again it will reverts to 19XX.  
The 1225 is built around a 65C02 as the control processor with 104K of SRAM, and 128K of firmware in a bank of EPROMs. There is a separate board under it that manages the display and keypad, which is powered by another 65C02 CPU and is using an MC68A45 CRT controller to drive display. The display board has 56K of RAM and 8K of ROM, with two coin cell batteries to retain settings. There is a bug that prevents the 1225 from keeping the date after the year 2000. Upon powering it off and on again it will revert to 19xx, e.g. 2018 will turn into 1918.
Example: 2018 -> 1918


==Easter egg==
===Easter egg===


Their is an "Easter egg" you can activate. When initially powered up the welcome screen shows, press the STOP button and a bar will show up with the programmers names near the bottom of the screen.
An "Easter egg" can be activated in the 1225 by pressing the STOP button when the welcome screen shows during power-up.  A bar with the programmers' names will display near the bottom of the screen.


==Links==
==Links==
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</gallery>
</gallery>


[[Category: Logic Analyzers]]
[[Category:Logic Analyzers]]
[[Category:Parallel printer interface]]
[[Category:RS-232 interface]]
[[Category:GPIB interface]]
[[Category:Introduced in 1989]]

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